A substitute on behalf of the girl who had died from a rare disease.

All her life, she had worked hard to gain love but as soon as her younger sister was born, she was abandoned and sent away to get married. Then on her way, she was assassinated by mysterious enemies.

"….Is this a dream?"

But when she opened her eyes, she returned back to 3 years in the past!

Since she is destined to get abandoned the moment her sister is born, she tries to live however she wants, but her life keeps turning wrong.

"Didn't you say you were interested in me?"

And a mysterious knight in dark clothes keeps pursuing her….